Pattern disruption device for crosswinding machines

ABSTRACT

In a crosswinding machine, a pattern disruption device, includes a crosswinding spool, a rotational member in frictional contact with said spool for effecting rotation thereof, means for intermittently driving the member and means for varying frictional contact between the crosswinding spool and the rotational member.

United States Patent rm Roh ner et al.

'[4 1 Nov. 12, 1974 1 1 PATTERN DISRUPTION DEVICE FOR CROSSWINDINGMACHINES [75] Inventors: Joachim Rohner, Rheydt; Wilhelm Maassen,Monchengladbach; Egon ll-laberkorn, Leusel, all of Germany W.Schlafhorst & C0., Monchengladbach, Germany 22 Filed: ,luneS, 1972 1211Appl. No.: 259,588

[73] Assignce:

[30] Foreign Application Priority Data June 12, 1971 Germany 2129318 2U.S. Cl. 242/181, 242/355 R [51 Int. Cl. B65h 54/38 58 Field of Search242/181, 35.5 R, 35.6 R, 242/18 R18 DD [56] References Cited UNITEDSTATES PATENTS 2,066,494 1/1937 Swanson 242/1811 3.031478 5/1962 Furst242/351 R FOREIGN PATENTS OR APPLICATIONS 586,069 3/1947 Great Britain.4 242/181 897,882 5/1962 Great Britain 242/181 Primary E.\uminerStanleyN. Gilreath Attorney, Agent, or Firnz-Herbert L. Lerner [57] ABSTRACT Ina crosswinding machine, a pattern disruption device, includes acrosswinding spool, a rotational memher in frictional contact with saidspool for effecting rotation thereof, means for intermittently drivingthe member and means for varying frictional contact between thecrosswinding spool ancl the rotational memher.

3 Claims, 1 Drawing Figure PATTERN DISRUPTION DEVICE FOR CROSSWINDINGMACHINES The invention relates to a pattern disruption device forcrosswinding machines wherein a crosswinding spool is rotated by meansof an intermittently driven rotating member in frictional contact withthe periphery thereof. v

Such devices have as their objective the prevention of the formation ofso-called pattern windings which are produced on the spool peripheryduring the wind ing operation from time to time, preferably, however,within specific diameter ranges.

In order to attain this objective, it has been known heretofore to drivethe crosswinding spool which engages a yarn guiding drum with amore-or-less strong compressive force in such a manner that the yarnguiding drum which reciprocatingly guidesv the yarn is brought intodriving contact with the driving roller rotating at a constantrotational speed, through a friction roller which is pivotedperiodically into operative posi-' tion. As a result thereof, after eachinterruption of the drive, and as the frictional roller is swung orpivoted back into operative position, the slip or backlash producedbetween the yarn guiding drum and the crosswinding spool tends todisrupt the formation of the pattern zone on the periphery of thewinding member. A similar result is expected from heretofore knowndevices whose construction is based on the slip or backlash effect,wherein either the crosswinding spool is continuously lifted away fromthe rotational member by which it is driven or wherein the drive motorfor the spool drive is continuously switched on and off. Anotherheretofore known possibility for disrupting patterns is for thecrosswinding spool to be intermittently swung or pivoted about atransverse axis, in which case either the spool or the rotational memberdriving the spool must have a conical shape. By means of this feature, aperiodically alternating take-up speed is supposed to be produced forthe driving contact, the smallest to the largest diameter at constantdriving speed for the rotational member.

The prior art devices of this general type are no longer sufficientlyeffective for the high take-up speeds that are to be attained nowadaysand that are also permissible for the yarn material. Furthermore, thesedevices effect the build-up or wind-up and thereby the unwindingproperties of a crosswinding or crosswound spool in an undesirablemanner, since particularly the yarn guiding reliability is weakened andin consequence thereof a great number of irregular yarn layers isproduced. Additionally, in the case of higher contact pressures asufficiently effective slip or backlash between the crosswinding spooland the rotational member is no longer available.

It is accordingly an object of the invention to avoid theabove-described disadvantages of heretofore known pattern disruptiondevices for crosswinding machines, wherein the crosswinding spool iscaused to rotate by means of an intermittently driven rotational body infrictional contact with the periphery thereof.

With the foregoing and other objects in view, there is provided inaccordance with the invention, a pattern disruption device wherein thecrosswinding spool and- /or the rotational member are so disposed thatthe frictional contact between the crosswinding spool and the rotationalmember is intermittently varied. In this case, it is of particularadvantage to vary the frictional connection therebetween intermittentlyby varying the compressive force. Thus, an additional slippage effect isproduced without raising the crosswinding spool away from the drivingrotational member which, for example, may be a winding shaft or a yarnguiding drum. The crosswinding spool is accordingly not fully liftedoff, but rather is stress-relieved by being raised. Thus, in view of theelasticity of the spool body, the contact of a crosswinding spool withthe driving rotational member is always maintained so that the yarnguiding reliability, especially, is not deteriorated in any manner. I

In accordance with a further feature of the invention,

the change of the frictional contact takes place in synchronism with theintermittent drive of the rotational member so that the intermittentdrive of the rotational member occurs in the same rhythm as theintermittent variation in the frictional contact. In such a synchonousoperation, it is also advantageous and in accordance with the invention,for the change in the frictional contact to be effected incounter-:synchronism to the intermittent drive of the rotational memberso that, for example, the frictional contact between the rotationalmember and the crosswinding spool decreases when the driving connectionhas been restored and the frictional contact increases whenever thedriving connection has been interrupted. In this way, by varying theinstant of change within a disruption interval, the best possibledisruption effect for the respective existing spool condition may beattained.

In order to attain optimal spooling condition during the entire build-upor formation of a crosswound spool, such as exact yarn guiding,unentangled yarn layering, as well as a clean spool form, it isparticularly advantageous and in accordance with another feature of theinvention for the change in the frictional contact during the winding tobe effected within predetermined diameter ranges during the build-up orformation of the crosswound coil. Since pattern windings occurespecially when the rotational speed relationship between yarn guidingdrum and crosswinding spool is equal to or attains values such as 1:1.5,1:2, 122.5, and so forth, the endangered diameter ranges may beascertained very easily within a crosswinding spool and may then betranslated to a cam plate or the like. Thus, if in accordance with theinvention, a change in the frictional contact takes place only withinthese diameter ranges, it becomes possible during the remaining windingperiod, to take up the yarn without any pattern disruption effect, or toprovide only the intermittent drive for the rotational member.

Other features which are considered as characteristic for the inventionare set forth in the appended claims.

Although the invention is illustrated and described herein as embodiedin pattern disruption device for crosswinding machines, it isnevertheless not intended to be limited to the details shown, sincevarious modifications and structural changes may be made therein withoutdeparting from the spirit of the invention and within the scope andrange of equivalents of the claims.

The construction and method of operation of the invention, however,together with additional objects'and advantages thereof will be bestunderstood from the following description of specific embodiments whenread in connection with the accompanying single FIG URE of the drawingwhich is a schematic, elevational the invention.

By way of introduction a winding machine of the general type beingconsidered herein is disclosed in US. Pat. No. 3,033,478 issued May 8,1962.

Referring now to the attached FIGURE, there is shown therein acrosswinding spool 1 being wound with a thread F coming from a supplycoil or cop 27. The crosswinding spool 1 is driven peripherally by arotational member 2, which is in the form of a yarn guiding drum. Thedrive of the rotational member 2 is rotated by a continuously drivendriving roller 3, which rotates with constant rotary speed through afriction roller 4 which is intermittently pivotable into and out ofposition between the drive roller 3 and the rotational member 2. Theintermittent motion is produced by an oscillating pivot shaft 5 andtransmitted through a lever 6 and a rod 7 to a rocker arm 8. During thetravel of the yarn F, the rocker arm 8 is supported by the upper portion28 of a sensing member 29 and thereby rocks a rocking lever 9, a rod 10and a bell crank 11. By means of the bell crank 11 and a strap 12, therocking movement is ultimately transferred to the friction roller 4. Inthe exemplified embodiment shown in the FIGURE, the change in thefrictional contact between the crosswinding spool l and the rotationalmember, in accordance with the invention, occurs in synchronism with theintermittent drive of the rotational body through the frictional roller4. Consequently, an additional lever 13 is fixedly connected to theoscillating shaft 5. The lever 13 is connected to a tension rod 14 towhich clamping member 15 and 16 are secured. The clamping members 15 and16 serve to hold and adjust tension springs 18 and 19 which, in turn,are suspended from the lever end 17 which is pivotally mounted at 34. Asthe oscillating shaft 5 turns together with the levers 6 and 13, duringthe intermittent oscillating or rocking movements thereof incounterclockwise direction, the frictional roller 4 is brought intooperative engagement through the rod 6 as well as the other componentmembers described hereinbefore. A force is simultaneously exerted on thelever end 17 through the tension rod 14 and the tension springs 18 and19, the force remaining ineffective, however, as long as an arm 20engages a pawl 21. When the crosswinding spool attains a predeterminedwound diameter, however, it can then, through a cam segment 23 fixedlysecured to the spool frame 22, swing the pawl 21 about the pivot 24thereof and withdraw the arm 20 from its point of contact. A spring 35biases the pawl 21 in a clockwise direction about pivot 24 as shown inthe drawing. The lever end 17 can now be swung away counterclockwiseabout pivot 34 by the tension spring 18 so that the detent 25 is broughtinto engagement in a gap between adjacent teeth of a tooth segment 26,also fixedly secured to the spool frame 22. The detent 25 is pivotallymounted on lever 17 at 30 and has a lug 31 adapted to contact lever 17.The lever 17 has a projection 32 and a spring 33 between the projection32 and detent 25 which biases the latter in the position shown in thedrawing. In this manner, the spool frame 22 and thereby the crosswindingspool 1 are stress-relieved by the adjustable force of the tensionspring 18. The cam segment 23 in the exemplifled embodiment, is providedwith four tooth-shaped contours which are associated with four diameterranges within a crosswound spool, wherein the change, in accordance withthe invention, of the frictional contact between the crosswinding spool1 and the rotational member 2 are to be effective. The crosswindingspool 1 is shown in the drawing just before a first pattern zone isattained. We claim:

1. In a crosswinding machine, a pattern disruption device, comprisingmeans supporting a crosswinding spool, a rotational member in frictionalcontact with said spool for effective rotation of said spool, means forintermittently driving said rotational member, and contact varying meansfor varying the magnitude of the frictional contact between saidcrosswinding spool and said rotational member while maintainingcontinuous physical contact between said crosswinding spool and saidrotational member, synchronizing means operable to provide that theintermittent drive of said rotational member by said drive means occursin a predetermined time relationship with the variation in magnitude ofthe frictional contact between said spool and said rotational member,wherein said synchronizing means operate in counter synchronism so thatthe magnitude of the frictional contact between said spool and saidrotational member increases when said intermittent drive of saidrotational member has been interrupted and decreases when saidintermittent drive of said rotational member has been restored.

2. Device according to claim 1, wherein said contact varying meansincludes means responsive to a given range of diameters attained by saidcrosswinding spool during the winding of a thread thereon, whereby saidcontact varying means is actuated only during predetermined diameters ofsaid crosswinding spool.

3. Device according to claim 1, wherein said contact varying meanscomprises biasing means and an actuating device for altering the contactpressure between said spool and said rotating member.

1. In a crosswinding machine, a pattern disruption device, comprisingmeans supporting a crosswinding spool, a rotational member in frictionalcontact with said spool for effective rotation of said spool, means forintermittently driving said rotational member, and contact varying meansfor varying the magnitude of the frictional contact between saidcrosswinding spool and said rotational member while Maintainingcontinuous physical contact between said crosswinding spool and saidrotational member, synchronizing means operable to provide that theintermittent drive of said rotational member by said drive means occursin a predetermined time relationship with the variation in magnitude ofthe frictional contact between said spool and said rotational member,wherein said synchronizing means operate in counter synchronism so thatthe magnitude of the frictional contact between said spool and saidrotational member increases when said intermittent drive of saidrotational member has been interrupted and decreases when saidintermittent drive of said rotational member has been restored. 2.Device according to claim 1, wherein said contact varying means includesmeans responsive to a given range of diameters attained by saidcrosswinding spool during the winding of a thread thereon, whereby saidcontact varying means is actuated only during predetermined diameters ofsaid crosswinding spool.
 3. Device according to claim 1, wherein saidcontact varying means comprises biasing means and an actuating devicefor altering the contact pressure between said spool and said rotatingmember.